Put timer_release in a separate file

git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@768 42af7a65-404d-4744-a932-0658087f49c3

1 files changed, 155 insertions, 0 deletions

diff --git a/nuttx/sched/timer_release.c b/nuttx/sched/timer_release.c
new file mode 100644
index 000000000..93ea686c5
--- /dev/null
+++ b/nuttx/sched/timer_release.c
@@ -0,0 +1,155 @@
+/********************************************************************************
+ * timer_release.c
+ *
+ *   Copyright (C) 2008 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <spudmonkey@racsa.co.cr>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ********************************************************************************/
+
+/********************************************************************************
+ * Included Files
+ ********************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <queue.h>
+#include <errno.h>
+
+#include <nuttx/kmalloc.h>
+
+#include "timer_internal.h"
+
+#ifndef CONFIG_DISABLE_POSIX_TIMERS
+
+/********************************************************************************
+ * Definitions
+ ********************************************************************************/
+
+/********************************************************************************
+ * Private Data
+ ********************************************************************************/
+
+/********************************************************************************
+ * Public Data
+ ********************************************************************************/
+
+/********************************************************************************
+ * Private Functions
+ ********************************************************************************/
+
+/********************************************************************************
+ * Function:  timer_free
+ *
+ * Description:
+ *   Remove the timer from the allocated timer list and free it or return it to
+ *   the free list (depending on whether or not the timer is one of the
+ *   preallocated timers)
+ *
+ ********************************************************************************/
+
+static inline void timer_free(struct posix_timer_s *timer)
+{
+  irqstate_t flags;
+
+  /* Remove the timer from the allocated list */
+
+  flags = irqsave();
+  sq_rem((FAR sq_entry_t*)timer, (sq_queue_t*)&g_alloctimers);
+
+  /* Return it to the free list if it is one of the preallocated timers */
+
+#if CONFIG_PREALLOC_TIMERS > 0
+  if ((timer->pt_flags & PT_FLAGS_PREALLOCATED) != 0)
+    {
+      sq_addlast((FAR sq_entry_t*)timer, (FAR sq_queue_t*)&g_freetimers);
+      irqrestore(flags);
+    }
+  else
+#endif
+    {
+      /* Otherwise, return it to the heap */
+
+      irqrestore(flags);
+      sched_free(timer);
+    }
+}
+
+/********************************************************************************
+ * Public Functions
+ ********************************************************************************/
+
+/********************************************************************************
+ * Function:  timer_release
+ *
+ * Description:
+ *   timer_release implements the heart of timer_delete.  It is private to the
+ *   the OS internals and differs only in that return value of 1 means that the
+ *   timer was not actually deleted.
+ *
+ * Parameters:
+ *   timer - The per-thread timer, previously created by the call to
+ *     timer_create(), to be deleted.
+ *
+ * Return Value:
+ *   If the call succeeds, timer_release() will return 0 (OK) or 1 (meaning that
+ *   the timer is still valid).  Otherwise, the function will return a negated errno:
+ *
+ *   -EINVAL - The timer specified timerid is not valid.
+ *
+ ********************************************************************************/
+
+int timer_release(FAR struct posix_timer_s *timer)
+{
+  /* Some sanity checks */
+
+  if (!timer)
+    {
+      return -EINVAL;
+    }
+
+  if (timer->pt_crefs > 1)
+    {
+      timer->pt_crefs--;
+      return 1;
+    }
+
+  /* Free the underlying watchdog instance (the timer will be canceled by the
+   * watchdog logic before it is actually deleted)
+   */
+
+  (void)wd_delete(timer->pt_wdog);
+
+  /* Release the timer structure */
+
+  timer_free(timer);
+  return OK;
+}
+
+#endif /* CONFIG_DISABLE_POSIX_TIMERS */